diff --git a/types/coin_benchmark_test.go b/types/coin_benchmark_test.go
index 34e93d6229..fc73afe87a 100644
--- a/types/coin_benchmark_test.go
+++ b/types/coin_benchmark_test.go
@@ -5,6 +5,10 @@ import (
 	"testing"
 )
 
+func coinName(suffix int) string {
+	return fmt.Sprintf("COINZ_%d", suffix)
+}
+
 func BenchmarkCoinsAdditionIntersect(b *testing.B) {
 	benchmarkingFunc := func(numCoinsA int, numCoinsB int) func(b *testing.B) {
 		return func(b *testing.B) {
@@ -12,10 +16,10 @@ func BenchmarkCoinsAdditionIntersect(b *testing.B) {
 			coinsB := Coins(make([]Coin, numCoinsB))
 
 			for i := 0; i < numCoinsA; i++ {
-				coinsA[i] = NewCoin("COINZ_"+string(i), NewInt(int64(i)))
+				coinsA[i] = NewCoin(coinName(i), NewInt(int64(i)))
 			}
 			for i := 0; i < numCoinsB; i++ {
-				coinsB[i] = NewCoin("COINZ_"+string(i), NewInt(int64(i)))
+				coinsB[i] = NewCoin(coinName(i), NewInt(int64(i)))
 			}
 
 			b.ResetTimer()
@@ -41,10 +45,10 @@ func BenchmarkCoinsAdditionNoIntersect(b *testing.B) {
 			coinsB := Coins(make([]Coin, numCoinsB))
 
 			for i := 0; i < numCoinsA; i++ {
-				coinsA[i] = NewCoin("COINZ_"+string(numCoinsB+i), NewInt(int64(i)))
+				coinsA[i] = NewCoin(coinName(numCoinsB+i), NewInt(int64(i)))
 			}
 			for i := 0; i < numCoinsB; i++ {
-				coinsB[i] = NewCoin("COINZ_"+string(i), NewInt(int64(i)))
+				coinsB[i] = NewCoin(coinName(i), NewInt(int64(i)))
 			}
 
 			b.ResetTimer()